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1/**
2 * @file oprofile_stats.c
3 *
4 * @remark Copyright 2002 OProfile authors
5 * @remark Read the file COPYING
6 *
7 * @author John Levon
8 */
9
10#include <linux/oprofile.h>
11#include <linux/smp.h>
12#include <linux/cpumask.h>
13#include <linux/threads.h>
14
15#include "oprofile_stats.h"
16#include "cpu_buffer.h"
17
18struct oprofile_stat_struct oprofile_stats;
19
20void oprofile_reset_stats(void)
21{
22 struct oprofile_cpu_buffer * cpu_buf;
23 int i;
24
25 for_each_cpu(i) {
26 cpu_buf = &cpu_buffer[i];
27 cpu_buf->sample_received = 0;
28 cpu_buf->sample_lost_overflow = 0;
29 }
30
31 atomic_set(&oprofile_stats.sample_lost_no_mm, 0);
32 atomic_set(&oprofile_stats.sample_lost_no_mapping, 0);
33 atomic_set(&oprofile_stats.event_lost_overflow, 0);
34}
35
36
37void oprofile_create_stats_files(struct super_block * sb, struct dentry * root)
38{
39 struct oprofile_cpu_buffer * cpu_buf;
40 struct dentry * cpudir;
41 struct dentry * dir;
42 char buf[10];
43 int i;
44
45 dir = oprofilefs_mkdir(sb, root, "stats");
46 if (!dir)
47 return;
48
49 for_each_cpu(i) {
50 cpu_buf = &cpu_buffer[i];
51 snprintf(buf, 10, "cpu%d", i);
52 cpudir = oprofilefs_mkdir(sb, dir, buf);
53
54 /* Strictly speaking access to these ulongs is racy,
55 * but we can't simply lock them, and they are
56 * informational only.
57 */
58 oprofilefs_create_ro_ulong(sb, cpudir, "sample_received",
59 &cpu_buf->sample_received);
60 oprofilefs_create_ro_ulong(sb, cpudir, "sample_lost_overflow",
61 &cpu_buf->sample_lost_overflow);
62 oprofilefs_create_ro_ulong(sb, cpudir, "backtrace_aborted",
63 &cpu_buf->backtrace_aborted);
64 }
65
66 oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mm",
67 &oprofile_stats.sample_lost_no_mm);
68 oprofilefs_create_ro_atomic(sb, dir, "sample_lost_no_mapping",
69 &oprofile_stats.sample_lost_no_mapping);
70 oprofilefs_create_ro_atomic(sb, dir, "event_lost_overflow",
71 &oprofile_stats.event_lost_overflow);
72 oprofilefs_create_ro_atomic(sb, dir, "bt_lost_no_mapping",
73 &oprofile_stats.bt_lost_no_mapping);
74}